The GOP nominates a businessman reformer to rescue failing Hartford.

Democrats again showed their eagerness to send a message against President Trump in Tuesday’s primaries, which threatens GOP control of statehouses. But perhaps the most intriguing result came in Connecticut, where businessman Bob Stefanowski won the GOP nomination for Governor on a bold reform platform to save the sinking state after years of failed public-union governance.

In Wisconsin, Democrats nominated state schools Superintendent Tony Evers to take on GOP Gov. Scott Walker. Unions are hoping to deny Mr. Walker a third...